I was trying to figure how to list fonts accessible to GTK (or pango actually), it turned out that pango.Context has a list_families() method that returns a tuple of pango.FontFamily objects.

Some thing like this:

window = gtk.Window()
context = window.get_pango_context()
families = context.list_families()

for i in families:
print i.get_name()

'Update: I rewrote this post and changed its title from Pango vs.

WebKit-r29336 using Pango for font rendering, enabling Arabic and other complex text rendering.

How beautiful is that!